Abstract
Activated carbon fibres (ACFs) are considered as the next generation of activated carbon products. However, lack of structural diversity in pore structure and high prices of raw materials for ACFs has restrained the development of ACF materials. In this paper, a sisal-based activated carbon fibre (SACF) material was prepared from sisal wastes with a unique thermal stabilization treatment to maintain fibrous shapes of SACFs while dispersing in solutions, and the SACFs were prepared as raw fibre materials for fuel evaporation emissions controlling products. Experimental results of N2 adsorption showed that SACF has a typical I-type adsorption isotherm, with specific surface area of SACF samples of approximately 1200 m2 g−1, and mainly microporous pore structure. Compared with commercial samples (specific surface area, 1841.29 m2 g−1), the butane working capacities of SACF for advanced fuel evaporation emissions controlling product was 0.4 g/100 ml higher. Furthermore, two dynamic models, Thomas model and Clark model, were applied to adsorption breakthrough data, which showed excellent fit. And it indicated from the adsorption breakthrough curves and parameters of both models that the SACF has better performance in fuel adsorption and desorption process than the commercial samples.
Highlights
Volatile fuel leaked from vehicles is among the most commonly occurring and widely distributed contaminants in the environment
Fuel adsorption performance was evaluated by butane working capacity (BWC) testing referring to ASTM D5228-92 (2015)
The results show that the size of multiple pores for the Activated carbon fibres (ACFs) sample is in the range of 0.5–2 nm, consistent with type I adsorption isotherm
Summary
Volatile fuel leaked from vehicles is among the most commonly occurring and widely distributed contaminants in the environment. The xylem fibres which are usually considered as the useless part of sisal leaves have irregular shape and break up during processing It was reckoned the xylem fibre production amounted to 0.7t/t sisal ribbon fibre [14,15,16]. Remarkable properties were investigated in those articles, such as high specific surface area, unique pore structure and rapid adsorption rate, but the shape of ACFs after hightemperature activation processing was not. In those studies, most ACFs produced from natural fibres melted together, which were no different from AC. ACFs we made showed superior performance compared with advanced commercial AC
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